What is CVE-2021-40405?

CVE-2021-40405 is a medium-severity vulnerability in Reolink Rlc-410w, classified under Improper Access Control. CVSS score: 6.5/10. Published 2022-04-14.

How severe is CVE-2021-40405?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2021-40405 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Reolink Rlc-410w

CVE-2021-40405

A denial of service vulnerability exists in the cgiserver.cgi Upgrade API functionality of Reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to a reboot. An attacker can send an HTTP request to trigger this vulnerability.

Published 2022-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Reolink Rlc-410w — versions v3.0.0.136_20121102
Reolink Rlc-410w Firmware — versions 3.0.0.136_20121102

Weakness classification (CWE)

Public proof-of-concept exploits

aredspy/ReoLink-Reboot

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1422 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40405?: CVE-2021-40405 is a medium-severity vulnerability in Reolink Rlc-410w, classified under Improper Access Control. CVSS score: 6.5/10. Published 2022-04-14.
How severe is CVE-2021-40405?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2021-40405 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.